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Abstract:

We perform a systematic study of &$B\bar{B}^*$;, &$B^*\bar{B}^*$;, &$D\bar{D}^*$; and &$D^*\bar{D}^*$; systems by using effective interaction in our chiral quark model. Our results show that the interactions of
&$B\bar{B}^*$;, &$B^*\bar{B}^*$;, &$D\bar{D}^*$; and &$D^*\bar{D}^*$; states are attractive, which consequently result in &$B\bar{B}^*$;, &$B^*\bar{B}^*$;, &$D\bar{D}^*$;
and &$D^*\bar{D}^*$; bound states. The recent observed exotic-like hadrons of Zb(10610) and Zb(10650) are, therefore, interpreted as loosely bound states of &$B\bar{B}^*$; and &$B^*\bar{B}^*$;, while
X(3872) and Y(3940) are &$D\bar{D}^*$; and &$D^*\bar{D}^*$; molecular states, respectively.